Device for starting winding operations in yarn winding machines



s. FURST 3,009,662

DEVICE FOR STARTING WINDING OPERATIONS IN YARN WINDING MACHINES 4Sheets-Sheet 1 Nov. 21, 1961 Filed June 5, 1956 Nov. 21, 1961 s. FURST3,0 2

DEVICE FOR STARTING WINDING OPERATIONS v IN YARN WINDING MACHINES FiledJune 5, 1956 4 Sheets-Sheet 2 Nov. 21, 1961 5 U s DEVICE FOR STARTINGWINDING QPERATIQNS 4 IN YARN WINDING MACHINES 4 Sheets-Sheet 15 FiledJune 5, 1956 Nov. 21, 1961 s. FURST 3,009,662

DEVICE FOR STARTING WINDING OPERATIONS IN YARN WINDING MACHINES FiledJune 5, 1956 4 Sheets-Sheet 4 United States Patent I 3,009,662 DEVICEFOR STARTING WINDING OPERATIONS IN YARN WINDING MACHINES Stefan Fiirst,M. Gladbach, Germany, assignor to Walter Reiners, M. Gladbach, GermanyFiled June 5, 1956, Ser. No. 589,454 Claims priority, applicationGermany June 10, 1955 Claims. (Cl. 24227) My invention relates to amethod and means for starting, in coil winding machines, the winding ofa new coil or bobbin after completion of a bobbin previously wound.

This application is an improvement in the methods and devices describedin my copending application Serial N0. 538,234, filed October 3, 1955.

The conventional method of starting a bobbin in automatic coil-changingwinding machines for textile manufacture is as follows. The yarn end ofa just completed bobbin is held fixed to the spindle head until afterthe next bobbin-winding operation is started. During starting of thenext bobbin, the yarn is either cut or torn from the previously woundbobbin. The severed end remains clamped beneath the core head of thebobbin being newly wound. Then the yarn end protrudes at the core headout of the bobbin. Reference may be had to my US. Patent 2,657,867 for amore detailed description of the operation of known automatic means forperforming the working actions required for the exchange of coils ateach particular winding station after the winding on the cop has reachedits predetermined size.

It is an object of my invention to provide a method and means for use inautomatic coil winding machines which causes this thread end to be stuckinto and beneath the first windings of the bobbin so that, when thebobbin is completely wound, the end will no longer protrude and cannotbecome entangled or cause disorder of the bobbined yarn during thesubsequent use of the bobbin.

To this end, and in accordance with my invention, the yarn end formingthe start of a new bobbin is gripped during an interval of time withinwhich the Winding spindle or spindle head is started and brought up tothe rated speed, and the yarn end is thereafter released not later thanwhen the rated operating speed of the spindle head is reached. Accordingto another feature of my invention, the just mentioned temporarygripping and timed releasing of the yarn end is effected by automaticmeans mounted on the spindle head.

Since, particularly during the first turns of yarn being wound upon abobbin core, some of these turns are wound in the vicinity of the borehead, the yarn end, upon its release, is caught into and beneath thefirst layers of yarn so that the continued winding operation results ina package of yarn from which only the end of the last-wound layer willprotrude but not the starting end of the first layer.

It is essential that the yarn end severed from the previously woundbobbin be clamped before the rotating winding motion for the next bobbinis started, and that the same yarn end be released at a given limitvalue of speed which is reached during the accelerating period of thewinding operation. Consequently, according to another feature of theinvention, the release of the previously clamped thread end is madedependent upon the speed or preferably the acceleration of the windingoperation during its starting interval.

The magnitude of the clamping force when starting the new windingoperation may either be larger or smaller than corresponds to thetearing force of the yarn being Wound. If the clamping force is greaterthan the tear limit of the yarn, then the yarn end, during starting ofthe next bobbin, is severed from the preceding bobbin simply by tearing.On the other hand, if the clamping force is smaller, then a separatecutting operation is needed for severing the yarn from the precedingbobbin. T 0 this end, a cutter or similar severing device may beprovided. In such cases, cutting may be effected immediately afterstarting the winding operation. If desired, however, the yarn may alsobe cut at an earlier moment prior to inserting the core of the nextbobbin to be wound; hence, the severing operation may be terminated arelatively long time prior to the starting moment of the next windingoperation. In the latter case, the yarn must be kept in a given positiona period of time sutlicient for the gripping operation so that the yarnend is securely clamped to the spindle head before the yarn is releasedfrom the cutting device.

According to another feature of the invention, the

severing device is so designed that the yarn is held fast by the cuttingmember itself with a holding force smaller than the clamping force thatholds the yarnv end to' the spindle head. As a result, the yarn end issimply torn out of the severing device by the pulling force of thefollowing winding operation. The most favorable forces to be exerted bythe clamping and severing devices may vary with different kinds of yarn.The clamping devices therefore are preferably designed to permit varyingand adjusting the clamping force.

The foregoing and more specific objects and features of the inventionwill be apparent from the following description in conjunction with theembodiments of devices according to the invention illustrated by way ofexample on the accompanying drawings in which: 7

FIG. 1 shows an individual winding station of a coil winding machine bya lateral view.

FIG. 2 shows the spindle head and adjacent components of the sameembodiment on a larger scale and partly in section.

FIGS. 3 and 4 are partial front views of the spindle head inrespectively different operating conditions.

FIGS. 5 and 6 show schematically a front view of part of the same devicein two different operating conditions, FIG. 6 being a fragmentary endview of the position of the spindle head according to FIG. 14. v

FIGS. 7, 8 and 9 illustrate front views of the spindle head andassociated parts for a somewhat modified design. 1 7

FIGS. 10 and 11 are schematic force diagrams explanatory of theoperation of the device in the condition shown in FIGS. 3 and 4respectively, for which purpose the diagrams of FIGS. 10 and 11 appearimmediatelyabove FiGS.3 and,4respectively.; r 1' '3. ,2 Ti

FIGS. 12 and 13 show, in cross section, two modifications of the spindlehead applicable in a machine other wise similar to the one describedwith. reference to'the preceding illustrations. 7 3

FIG. 14 shows an individual winding station similar to FIG. 1 butprovided with adevice for facilitating the; starting of a new winding.

FIG. 15 shows a further modification of the spindle head, and FIG. 16 afront view of a component of the same device.

FIG. 17 is a perspective view of a coil winding machine comprising anumber of coil winding stations ac cording to the invention.

As a rule, a coil winding machine of the type here of interest comprisesa large number of individual winding stations as exemplified by FIG. 17.Each station is supplied with yarn from a package A from which thethread passes through an eye B or other guide means to the thread guideof the winding unit proper. v

FIG. 1 shows the essential parts of one of the coil winding stations ofthe machine. It comprises a spindle Patented Nov. 21, 186i head Imounted on a winding spindle 1a which is journalled in, and protrudesfrom, a gear housing 1b and, when in operation, is driven in thedirection of rotation denoted by an arrow 1c. Mounted between thespindle head 1 and a counter bearing 2 is the bobbin core or quill 3 tobe covered with a package of yarn. A rotating thread guide 4 is mountedon a shaft 4a which is also journalled in the gear housing 1b and duringoperation of the winding station rotates simultaneously with spindle 1a.FIG. 1 shows the winding station shortly after a completely wound bobbin5 has been discharged into a receiving tray 6 and has been pushed to therear side of the station. The yarn F, coming from the supply package (Ain FIG. 17) passes through a guiding groove 4b of the rotating threadguide 4 past the spindle head 1 to the full bobbin 5. Mounted betweenspindle head 1 and receiving tray 6 is a severing and clamping device 7(FIGS. 1, 7, 8, 9) which is active after each coil change.

- When, after termination of a winding operation, the full coil dropsout of the coiling position into the trough 6 and is pushed to the leftof the trough (according to the view of FIGURE 1) by a suitable pusherarm (not shown), such as is described in my Patent No. 2,657,867, thenthe thread F from the completely wound coil 5 must pass from the rightend of the coil, past the coil entrainer head 1, to the thread guide 4.Separate means are not necessary for correctly positioning the thread,and the thread automatically takes the position according to thatillustrated in FIGURE 7 after the arm 7 has seized and clamped thethread. Consequently, the Winding spindle can then come to a standstillat any rotary position during the preceding winding operation. However,if it starts running at the beginning of the now succeeding coil windingoperation, then the gripper hook 8, which has for its purpose to fastenand hold the thread, has now moved into the angular position shown inFIGURE 7. In this position, the gripper hook 8 seizes the thread lyingacross the head of the spindle, as shown in FIGURE 7. Gripper hook 8 isadapted to function moving from any rotary position of spindle head 1 tothat of FIGURE 7, and it is immaterial in which position the spindlehead has previously come to rest.

Once the thread is seized from the finished coil 5 and clamped by thegripper hook 8, it then travels during the winding operation, or else itis severed oft" at its most highly stressed position by means of shears16 1718 (FIGURES 5, 6) located between the clamping position of the arm7 and the gripper 8.

v A hook 8 is mounted on spindle head 1 and is displaceable androtatable relative thereto (FIGS. 1 to 11). Hook 8 is rigidly connectedwith an unbalance weight 9 (FIG. 2) by means of a shaft 10. Weight 9 hasa slanting cam portion 11 in sliding engagement with a correspondingslanted cam portion 12 of the spindle head 1. As a result, a rotatingmovement of weight 9 causes not only a corresponding rotation of hook 8but also a shifting motion of hook 8 parallel to the axis of shaft 10,this shifting motion being caused by the interengagement of the camfaces 11 and 12. The weight 9 is biased by a spring 13 tending to retainthe weight 9 within a recess 14 of the spindle head, this position beingbest apparent from FIGS. 2 and 3.

The hook or catch member 8 which clamps the yarn is rigidly connectedwith the weight or body 9. This body is under the action of a spring 13of which one end is fixed in the spindle head 1, and the other end isfixed at the body 9. A fastening of spring 13 to body 9 can be effectedin the same manner as at the spindle head 1 (see FIG. 2), namely bymeans of an angular portion of the spring wire which enters into a borein body 9. The spring end may also be fastened to the body 9 by means ofpoint welding. The body 9 is normally held by spring 13 in the positionillustrated in FIG. 2. The body 9 then lies in a recess 14 of thespindle head and its cam portion 11 rests upon a cam recess 12 of thespindle head 1. The body 9 was urged into this position by the rotatingreturning action and axial shoving force of the spring 13 which causesthe body 9 to perform a returning rotation as well as an axialdisplacement. The body 9 will remain in this position under the actionof spring 13 also during the initially slow starting operation. Onlywhen the speed of rotation has exceeded a given predetermined magnitudewill the body 9 rotate outwardly under the effect of the now increasedcentrifugal force, and the turning motion of the shaft 10 of the catchmember 8, due to the sliding of cam portion 11 upon cam portion 12, alsocauses the axial displacement which releases the yarn end. This motionof shaft 10, and hence also of catch member 8, however, takes place onlyafter the spindle head 1 has reached a relatively high speed ofrotation, i.e. shortly before the normal operating speed is attained.Separate means which cause the yarn end to be released and which operateby extraneous action are, therefore, not

necessary.

The spindle head 1 has a recess 1d (FIG. 2) at its front side whichengages and centers the head 3a of the bobbin core 3. The rim of thespindle head 1 facing the bobbin head has a projecting portion 15 (FIGS.1 to 4) which has a concave recess within the range of rotary motion ofhook 8 as is apparent particularly from FIG. 1. This recess permits thethread F to more readily enter into the operating range of book 8 assoon as the thread, during coil change, is placed in the vicinity of thespindle head. When during coil change the full bobbin 5 is pushed to therear, the thread F is simultaneously shifted into engagement with hook 8and, during the subsequent starting motion of the spindle head, isseized by the hook. Thus the thread is clamped fast between the book 8and the front face of the spindle head shortly after initiation ofspindle rotation. The clamping force must be so large that the threadwill tear between the temporarily active thread-clamping device 7 (FIGS.7, 8, 9) and the hook 8. According to a modification however, theclamping device 7 may be replaced by a combined clamping and cuttingdevice which automatically severs the thread, for instance by a cutter16, 17 as illustrated in FIGS. 5 and 6. The cutter is preferablysupplemented at the rear of the cutter blades 17 by a clamping member 18which holds the end of the thread in clamped condition only until thethread is seized by the hook and is pulled out of the clampingengagement. As soon as the end of the thread F is seized and firmlyclamped by book 8, three or four turns of spindle head and bobbin coreare usually sufficient to make the thread self-adhering to the bobbincore. After a few turns are wound up, the yarn end becomes covered bylayers of thread and is thus fixed upon the core of the coil so that theyarn end cannot unwind itself when being released by the gripper 8. Asaforesaid, for thus covering the starting end of the yarn, two to threerotations of the winding spindle are necessary. The release of the yarnend fixed to the gripper hook 8 is preferably effected by centrifugalforce. When first starting the winding operation, the winding spindlerequires some period of time and consequently a number of rotations inorder to reach its full speed. This number is approximately 10 to 15revolutions of the winding spindle.

During the subsequent starting operation, while the rotating speed ofthe spindle head is gradually increasing, the unbalance weight 9 issubjected to an accelerating force A (FIGS. 3, 10) which retains theweight and acts in opposition to the direction of the rotating motiondenoted by the arrow 10. Consequently, at first, the hook 8 also remainsturned forward in the direction of rotation 1c (FIG. 3). However, whenthe rotary speed of the spindle head reaches a considerably higher valuewhich may occur already after a few turns of thread are wound, then acentrifugal force C (FIGS. 10, 4, l1)

becomes increasingly effective in addition to the force of accelerationA, because the gravity center S (FIGS. 3, 4) of the weight 9 is notlocated on the pivot axis which is identical with the axis of shaft 10.Consequently, the unbalance weight 9 remains in the position of FIG. 3only as long as the centrifugal force 3, or its active component, doesnot exceed the counteracting force of component of acceleration.However, when the speed of spindle rotation reaches its rated value, thecentrifugal force C (FIGS. 4, 11) considerably exceeds the force ofacceleration. The resultant force R then flings the balance weight 9 outto the position shown in FIG. 4. During this movement, shaft alsorotates the hook 8 about its pivot axis in opposition to the directionof rotat'ion 1c, i.e. to the rear. Since, as described above, the rotarymovement of unbalance weight 9 produces an axial displacement of thehook 8, the hook now releases the thread F which is flung upwardly bycentrifugal force and enters into the range of the turns of thread beingwound near the bobbin head 3a. As a result, only a few turns, forinstance, three or four, are sufficient to thus wind the end of thethread into the starting portion of the bobbin being wound.

As a result, the starting end of the yarn or the bobbin is firmly andreliably coiled into and beneath layers of yarn and can no longerprotrude or hang out of the bobbin. Approximately twenty turns aresufficient, for instance, to completely cover the yarn end.

In FIGS. 10 and 11 there is shown how the effects of the individualforces combine with each other in accordance with a force vectordiagram, or parallelogram. The centrifugal force, aside from overcomingthe spring force 13, is also required to overcome the force ofacceleration during the starting operation, which accelerating force iseffective upon the center of gravity S of body 9 only during thestarting period. However, when the spindle head 10 has approximatelyattained its highest speed of rotation, then the acceleration has becomesmall, as is shown in the vector diagram of FIG. 11, whereas thecentrifugal force has become large. Consequently, the resultant force Racting at the gravity center S is also large, so that the body 9 turnsoutwardly with the effect of causing the above-described rotating motionof the catch member 8 and the subsequent release of the yarn 11.

It will be recognized that in a device according to the invention, thespindle head with its gripping and clamping device is active during thestarting period of the spindle to catch the thread, to clamp it, and toagain release it after a given interval of starting operation. Utilizedfor performing this automatic operation isthe force of accelerationacting upon an unbalance weight, and also the centrifugal force whichsubsequently overpowers the effect of acceleration I upon the weight.Switching from clamping to releasing of the thread occurs when a givenrevolving speed is exceeded. The angle of rotating motion traversed bythe unbalance weight during the just-mentioned starting interval is lessthan 180. In many cases an angular movement of about 90 is sufficient.The angular position of the clamping hook 8 is preferably so chosenthat, when starting, it forms an angle of about 45 with the spindleradius extending through the pivot axis of the hook, whereas after thereleasing motion the hook 8 forms about the same angle of 45 with thesame radius in the opposite direction.

According to another feature of my invention, the control of thegripping and clamping device of the spindle head is effected by meansextraneous to the spindle head and of the parts rotating togethertherewith. Embodiments of this kind are illustrated in FIGS. 12 and 13.

According to FIG. 12, the unbalance weight in a device otherwise similarto that described with reference to FIGS. 1 through 11, is substitutedby the armature 21 of an electromagnetic device, the armature cooperateswith a stationary field system 22 of annular shape which surrounds thespindle head 1 and forms a pole gap of annular shape adjacent to thepath of rotation of the armature 21 about the spindle 1a. When the coil22a of the magnet system 22 is electrically excited, the field magnetattracts the armature 21. Mounted on the armature 21 is a cam 11' whichcooperates with a cam face 12' of the spindle head 1 to impart rotatingmovement to the armature 21 about the axis of the hook shaft 10 when thearmature 21 is moved by magnet 22 toward the left. Consequently, theaxial movement of hook 8 caused by the excitation of magnet 22 isaccompanied by a rotating movement of hook 8 so that the hook, whenmagnet 22 is excited, is placed into thread-clamping position. Theelectromagnet is excited only when the spindle'la is stopped and duringthe starting interval, but is switched off during the coil windingoperation as soon as a given revolving speed or the rated speed isreached.

In the modification illustrated in FIG. 13, otherwise similar to thedevice described with reference to FIGS. 1 through 11, the operation ofclamping hook 8 is controlled by extraneous mechanical means. The hookshaft 10' is designed as a threaded spindle of high pitch which is inthreaded engagement with the spindle head 1 so that axial displacementof shaft 10 is accompanied by the desired rotating movement of shaft 10'and hook 8. The shaft 10 has a cam 23 for cooperation with therespective slide-cam: faces of twocam members 24 and 25. The cam members24, 25' have limited length in the peripheral direction of the spindlehead and each acts upon the cam 23 as the cam passes by the member 24 or25, provided the cam member is shifted into the path of cam 23.Displacement of the cam members 24 and 25 in the directions indicated byrespective arrows 24a and 25a thus causes the shaft 10' to shift axiallyand to simultaneously rotate the hook 8. The proper clamping andreleasing positions of hook 8 are secured by means of catches 26 and 27each comprising a spring located in a bore of spindle head 1 and aspring-biased ball which catches into a groove or recess of shaft 10 inone or the other limit position of the hook 8. The actuation of cammembers 24 and 25 is effected either mechanically or in any otherdesired manner in conjunction with the coil changing operation.

In the embodiment shown in FIGS. 15 and 16, which otherwise is similarto those previously described, a propeller vane or a small turbine wheel32 is mounted on the shaft 10 of hook 8. Turbine wheel 32 extends on oneside into the spindle head 1 and protrudes therefrom on the other side.Whilethe spindle head rotation is just beginning, and as long as thespeed thereof is still slow, the vaned wheel 32 has toovercome onlyslight air resistance. Consequently, the force acting upon theprotruding portion of the wheel and stemming from the air resistance canexert only a slight torque upon the shaft 10. With increasing speed ofthe spindle head 1, however, the force acting upon the vaned wheel 32likewise increases. The spring 13 and the vanes of wheel 32 are sodimensioned that shortly before attaining the normal operating speed ofthe spindle head, the force acting upon the vaned wheel 32 is largeenough to overcome the force of spring 13. Then the shaft 10 of thegripper hook 8 is turned as a result of the torque imposed upon theshaft by the vaned wheel 32. Simultaneously with the rotating motion,the gripper shaft 10 is axially displaced by the cam portion 11 slidingupon the cam 12. Hence, the gripper book 8 is also displaced axially,thus releasing the yarn end. Once the yarn end is released, it followsthe centrifugal force and hence protrudes perpendicularly away from theaxis of the coil core. It is it relevant whether the yarn end is thenstraight or has a curved shape, and it in any event becomes covered bysubsequent turns of yarn being wound up. Only when the spindle head 1rotates at sufficiently high speed, is the force exerted upon member 32by air friction so large as to cause rotation of shaft 10 relative tothe spindle head. Cam faces at 11, 12 are provided as in theabove-described embodiments for producing a simultaneous axial movementof shaft and book 8. In such a device, the air current can be utilizednot only for the control of the hook 8 but also for acting upon the endof the thread as soon as it is released from hook 8 so that the end iscaused to flutter. This has the effect of bringing the thread end, atleast temporarily, into the range of the thread running onto the bobbincore, thus expediting the coiling and covering of the loose end into thelayers of thread being wound onto the core.

Devices according to the invention may further be equipped with a guidemember 31 as illustrated in FIG. 14. The guide member 31 consists ofwire and is located in the vicinity of the bobbin head. It enters intothe path of the loose thread end, as soon as the end is released by thehook 8, with the effect of urging the hook temporarily toward the axisof the bobbin and producing a flutter motion of the thread end. Thisflutter motion is produced as close as possible to the running-on pointof the thread being wound so that the free end is readily caught by theincoming thread and is securely covered by the first few turns of threadbeing wound onto the core. The guide member 31, as shown in FIG. 14, maybe mounted on the clamping or cutting device 7 because this device,after starting of the new coil has terminated its clamping or cuttingactivity for the particular coil being wound. Consequently, the threadend is moved close to the running-on point of the incoming thread F inthe direction required for having the loose end covered by the thread.The position occupied by device 7 and member 31 when thus effective isshown in FIG. 14 by dotand-dash lines. Guide member 31 is affixed tocarrying arm 7 which clamps the yarn during the coil exchange.

It will be apparent to those skilled in the art that my inventionpermits of various modifications and may be embodied or performed indevices other than those particularly illustrated and described, withoutdeparting from the essential features of my invention and within thescope of the claims annexed hereto.

I claim:

1. In a yarn-coil winding machine, a device for startmg a coil windingoperation after completion of the precedingly wound coil, comprising arevolvable spindle head having means for entraining a coil core, athread guide defining a path for the yarn to be wound onto the core, ayarn clamping device having an eccentrically disposed shaft journalledin said spindle head in parallel relation to and oflset with respect tothe axis of revolution, said shaft being axially and revolvablydisplaceable relative to said spindle head, said clamping device havinga yarnclampmg member mounted on and comprising an angular extension ofsaid shaft on the spindle-head side facing the core, and said devicehaving automatic means cooperatively joined with said shaft for causingautomatic simultaneous axial displacement and revolution of said shaftwas to move said clamping member angularly as well as axially betweenyarn-clamping and yarn-releasing positrons, the angular movement causingthe displacement of the yarn-clamping surface of the clamping member ina direction having at least a substantial radial component, saidautomatic means being adapted to actuate said clamping device to clampthe yarn end only during the starting interval of said spindle head, theyarn end when released being wound into and beneath the yarn layerssubsequently wound onto the core.

2. In a coil starting device according to claim 1, said automatic meanscomprising a weight pivotally mounted on said spindle head and movablebetween two angular positions relative thereto to produce said radialdisplacement, said weight being connected with said shaft for impartingcontrol motion thereto and being subject to force of peripheral linearacceleration and centrifugal force due to revolution of said spindlehead, said force of peripheral linear acceleration having relative tosaid weight a direction corresponding to movement of said clampingmember toward the yarn clamping position, and said centrifugal forcehaving relative to said weight a direction corresponding to movement ofsaid clamping member toward the yarn releasing position, whereby saidweight causes said clamping device to clamp the yarn end at the start ofthe coil winding operation and to release the yarn end due toacceleration of said spindle head shortly prior to reaching the ratedwinding speed.

3. In a coil starting device according to claim 2, said weight beingfixedly mounted on said shaft, and the respective centers of gravity ofsaid weight and of said clamping member being located on respectiveradii angularly spaced approximately 45 from each other.

4. In a coil starting device according to claim 2, said shaft and saidclamping member having a range of angular movement of approximately 5. Acoil starting device according to claim 1, comprising a yarn deflectormember mounted near said spindle head and displaceable into the path ofthe yarn end when the yarn end is released from said clamping device,whereby the yarn end is urged toward and beneath the incoming yarn beingwound.

6. In a yarn-coil winding machine, a device for starting a coil windingoperation after completion of the preceding coil, comprising arevolvable spindle head having means for entraining a coil core, athread guide defining a path for the yarn to be wound onto the core, ayarn clamping device mounted on and rotating at the same angularvelocity and about the same axis, as said spindle head, said clampingdevice having a yarn clamping portion displaceable in a direction havinga radial component, said portion being engageable with the yarn comingfrom said guide, said portion being radially displaceable between yarnclamping and yarn releasing positions, and automatic control meansconnected with said clamping device for causing said portion to bedisplaced radially to keep the yarn end clamped during the startinginterval of said spindle head and to subsequently be displaced radiallyin opposite direction to release the yarn end, the yarn end whenreleased being wound into and beneath the yarn layers that have beenwound onto the core.

7. In a yarn-coil winding machine, a device for starting a coil windingoperation, comprising a revolvable spindle head for entraining a coilcore on which the yarn is to be wound, a yarn clamping device comprisinga clamping member mounted for movement longitudinally of the rotationalaxis of the spindle head and for rotation about said axis at the sameangular velocity as the spindle head, the clamping member having pivotmeans permitting it to also turn in a plane transverse to saidrotational axis, automatic means to shift the member longitudinally andto turn it in one direction transversely to hold the beginning portionof the yarn while the coil is started on the coil core, and to shift themember longitudinally in the opposite direction and to turn it inanother direction transversely to release the said portion after a fewturns of the coil have been wound on the core.

8. In a yarn-coil winding machine, a device for starting a coil windingoperation, comprising a revolvable spindle head for entraining a coilcore on which the yarn is to be wound, a yarn clamping device comprisinga clamping member mounted for movement longitudinally of the rotationalaxis of the spindle head and for rotation about said axis at the sameangular velocity as the spindle head, the clamping member having pivotmeans permitting it to also turn in a plane transverse to saidrotational axis, automatic means to shift the member longitudinally andto turn it in one direction transversely to hold the beginning portionof the yarn while the coil is started on the coil core, and to shift themember longitudinally in the opposite direction and to turn it inanother direction transversely to release the said portion after a fewturns of the coil have been wound on the core, said automatic meanscomprising a weight mounted for rotation with and about the rotationalaxis of the spindle head, the weight being operatively connected to saidclamping member, the Weight being urged radially outwardly when therotational speed of the spindle reaches a predetermined value, toaccomplish said release, the clamping device and the spindle head havingabutting cam surfaces which cooperate to produce one of saidlongitudinal shifting movements.

9. In a yarn-coil winding machine, a device for starting a coil windingoperation, comprising a revolvable spindle head for entraining a coilcore on which the yarn is to be wound, a yarn clamping device comprisinga clamping member mounted for movement longitudinally of the rotationalaxis of the spindle head and for rotation about said axis at the sameangular velocity as the spindle head, the clamping member having pivotmeans permitting it to also turn in a plane transverse to saidrotational axis, automatic means to shift the member longitudinally andto turn it in one direction transversely to hold the beginning portionof the yarn while the coil is started on the coil core, and to shift themember longitudinally in the opposite direction and to turn it inanother direction transversely to release the said portion after a fewturns of the coil have been wound on the core, said automatic meanscomprising an air resistance-driven turbine turning with the spindlehead and connected to turn the clamping member on its pivot means whenair friction is sufficiently great, the clamping device and the spindlehead having abutting cam surfaces which cooperate to produce one of saidlongitudinal movements.

10. In a yarn-coil winding machine, a-device for starting a coil windingoperation after completion of the precedingly wound coil, comprising arevolvable spindle head having means for entraining a coil core, athread guide defining a path for the yarn to be wound onto the core,

a yarn clamping device having a shaft journalled in said spindle head inparallel relation to the axis of revolution, said shaft being axiallyand revolvably displaceable relative to said spindle head, said clampingdevice having a yarn-clamping hook member mounted on and comprising anangular extension of said shaft on the spindle-head side facing thecore, the spindle head having on said side facing the core a rim havinga recessed surface within the operating range of said hook member, andsaid device having means cooperatively joined with said shaft andabutting a surface of said spindle head for causing automaticsimultaneous axial displacement and revolution of said shaft so as tomove said clamping member angularly as well as axially betweenyarn-clamping and yarn-releasing positions, the angular movement causingthe radial displacement of the yarn-clamping surface of the clampinghook member, and automatic control means for actuating said clampingdevice to clamp the yarn end between the hook member and said recessedsurface only during the starting interval of said spindle head, the yarnend when released being wound into and beneath the yarn layerssubsequently wound onto the core, said automatic means comprising aweight eccentrically pivoted on a pivot which is mounted for rotationwith and about the rotational axis of the spindle head, the weight beingoperatively connected with the clamping member, the Weight being urgedto turn on its pivot outwardly from the spindle head axis when therotational speed of the spindle head re aches a predetermined value.

References Cited in the file of this patent UNITED STATES PATENTS2,657,867 Furst Nov. 3, 1953 2,692,089 Siegenthaler Oct. 19, 19542,718,360 Joyce Sept. 20, 1955 FOREIGN PATENTS 712,617 Great BritainJuly 28, 1954;

